Hydrogenation Driven Conductive Na2Ti3O7 Nanoarrays as Robust Binder-Free Anodes for Sodium-Ion Batteries

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• 作者：Shidong Fu ; Jiangfeng Ni ; Yong Xu ; Qiao Zhang ; Liang Li
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：4544-4551
• 全文大小：664K
• 年卷期：0
• ISSN：1530-6992

文摘

We present a general and rational approach to fabricate highly accessible and affordable sodium-ion battery anodes by engineering three-dimensional hydrogenated Na₂Ti₃O₇ nanoarrays supported on flexible Ti substrates. The hydrogenated Na₂Ti₃O₇ nanoarrays exhibit desirable properties for sodium storage, such as high surface area, high electrical conductivity, and Na⁺ diffusivity. The as-obtained nanoarrays demonstrate remarkably stable and robust Na-storage performance when tested as binder-free anodes for sodium-ion battery. They can afford a high reversible (desodiation) capacity of 227 mAh g^–1 and retain a capacity of 65 mAh g^–1 over 10,000 continuous cycles at a high rate of 35 C. Therefore, through this synergy of array architecture and hydrogenation, it is possible to engineer numerous anodes that can reversibly store Na⁺ ions in a fast and stable manner.